[Linux] centos7.2 服务器 使用df -h卡死问题


本文总阅读量次

1、服务器使用df -h命令卡死，crtl+c没有反应，ps -ef|grep df 命令杀掉df -h进程也无效。

2、重新启动会话，使用strace跟踪df -h执行状态

strace df -h

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execve("/usr/bin/df", ["df", "-h"], [/* 24 vars */]) = 0
brk(NULL)                               = 0x1e9c000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7efe77097000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=19527, ...}) = 0
mmap(NULL, 19527, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7efe77092000
close(3)                                = 0
open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0 \34\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=2107816, ...}) = 0
mmap(NULL, 3932736, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7efe76ab6000
mprotect(0x7efe76c6c000, 2097152, PROT_NONE) = 0
mmap(0x7efe76e6c000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1b6000) = 0x7efe76e6c000
mmap(0x7efe76e72000, 16960, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7efe76e72000
close(3)                                = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7efe77091000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7efe7708f000
arch_prctl(ARCH_SET_FS, 0x7efe7708f740) = 0
mprotect(0x7efe76e6c000, 16384, PROT_READ) = 0
mprotect(0x616000, 4096, PROT_READ)     = 0
mprotect(0x7efe77098000, 4096, PROT_READ) = 0
munmap(0x7efe77092000, 19527)           = 0
brk(NULL)                               = 0x1e9c000
brk(0x1ebd000)                          = 0x1ebd000
brk(NULL)                               = 0x1ebd000
open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=106065056, ...}) = 0
mmap(NULL, 106065056, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7efe7058f000
close(3)                                = 0
open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2502, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7efe77096000
read(3, "# Locale name alias data base.\n#"..., 4096) = 2502
read(3, "", 4096)                       = 0
close(3)                                = 0
munmap(0x7efe77096000, 4096)            = 0
open("/usr/share/locale/zh_CN.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/zh_CN.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/zh_CN/LC_MESSAGES/coreutils.mo", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=190751, ...}) = 0
mmap(NULL, 190751, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7efe77060000
close(3)                                = 0
open("/usr/share/locale/zh.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/zh.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/zh/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/etc/mtab", O_RDONLY|O_CLOEXEC)   = 3
fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7efe77096000
read(3, "rootfs / rootfs rw 0 0\nsysfs /sy"..., 1024) = 1024
read(3, "ev,noexec,relatime,freezer 0 0\nc"..., 1024) = 1024
read(3, "sd rw,relatime 0 0\n", 1024)   = 19
read(3, "", 1024)                       = 0
close(3)                                = 0
munmap(0x7efe77096000, 4096)            = 0
open("/usr/lib64/gconv/gconv-modules.cache", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=26254, ...}) = 0
mmap(NULL, 26254, PROT_READ, MAP_SHARED, 3, 0) = 0x7efe77059000
close(3)                                = 0
stat("/", {st_mode=S_IFDIR|0555, st_size=4096, ...}) = 0
stat("/sys", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat("/proc", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat("/dev", {st_mode=S_IFDIR|0755, st_size=3140, ...}) = 0
stat("/sys/kernel/security", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/dev/shm", {st_mode=S_IFDIR|S_ISVTX|0777, st_size=40, ...}) = 0
stat("/dev/pts", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/run", {st_mode=S_IFDIR|0755, st_size=740, ...}) = 0
stat("/sys/fs/cgroup", {st_mode=S_IFDIR|0755, st_size=280, ...}) = 0
stat("/sys/fs/cgroup/systemd", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/fs/pstore", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/memory", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/cpu,cpuacct", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/net_cls", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/freezer", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/devices", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/blkio", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/perf_event", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/cpuset", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/hugetlb", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/kernel/config", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/", {st_mode=S_IFDIR|0555, st_size=4096, ...}) = 0
stat("/proc/sys/fs/binfmt_misc"

df -h进程在”/proc/sys/fs/binfmt_misc”这个位置卡主了

3、启动另一个会话，重新挂在这个目录

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systemctl restart proc-sys-fs-binfmt_misc.automount

4、strace df -h 跟踪的进程内容有新的输出，完整信息输出如下：

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execve("/usr/bin/df", ["df", "-h"], [/* 24 vars */]) = 0
brk(NULL)                               = 0x1e9c000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7efe77097000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=19527, ...}) = 0
mmap(NULL, 19527, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7efe77092000
close(3)                                = 0
open("/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0 \34\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=2107816, ...}) = 0
mmap(NULL, 3932736, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7efe76ab6000
mprotect(0x7efe76c6c000, 2097152, PROT_NONE) = 0
mmap(0x7efe76e6c000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1b6000) = 0x7efe76e6c000
mmap(0x7efe76e72000, 16960, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7efe76e72000
close(3)                                = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7efe77091000
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7efe7708f000
arch_prctl(ARCH_SET_FS, 0x7efe7708f740) = 0
mprotect(0x7efe76e6c000, 16384, PROT_READ) = 0
mprotect(0x616000, 4096, PROT_READ)     = 0
mprotect(0x7efe77098000, 4096, PROT_READ) = 0
munmap(0x7efe77092000, 19527)           = 0
brk(NULL)                               = 0x1e9c000
brk(0x1ebd000)                          = 0x1ebd000
brk(NULL)                               = 0x1ebd000
open("/usr/lib/locale/locale-archive", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=106065056, ...}) = 0
mmap(NULL, 106065056, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7efe7058f000
close(3)                                = 0
open("/usr/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=2502, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7efe77096000
read(3, "# Locale name alias data base.\n#"..., 4096) = 2502
read(3, "", 4096)                       = 0
close(3)                                = 0
munmap(0x7efe77096000, 4096)            = 0
open("/usr/share/locale/zh_CN.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/zh_CN.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/zh_CN/LC_MESSAGES/coreutils.mo", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=190751, ...}) = 0
mmap(NULL, 190751, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7efe77060000
close(3)                                = 0
open("/usr/share/locale/zh.UTF-8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/zh.utf8/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/usr/share/locale/zh/LC_MESSAGES/coreutils.mo", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/etc/mtab", O_RDONLY|O_CLOEXEC)   = 3
fstat(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7efe77096000
read(3, "rootfs / rootfs rw 0 0\nsysfs /sy"..., 1024) = 1024
read(3, "ev,noexec,relatime,freezer 0 0\nc"..., 1024) = 1024
read(3, "sd rw,relatime 0 0\n", 1024)   = 19
read(3, "", 1024)                       = 0
close(3)                                = 0
munmap(0x7efe77096000, 4096)            = 0
open("/usr/lib64/gconv/gconv-modules.cache", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=26254, ...}) = 0
mmap(NULL, 26254, PROT_READ, MAP_SHARED, 3, 0) = 0x7efe77059000
close(3)                                = 0
stat("/", {st_mode=S_IFDIR|0555, st_size=4096, ...}) = 0
stat("/sys", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat("/proc", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat("/dev", {st_mode=S_IFDIR|0755, st_size=3140, ...}) = 0
stat("/sys/kernel/security", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/dev/shm", {st_mode=S_IFDIR|S_ISVTX|0777, st_size=40, ...}) = 0
stat("/dev/pts", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/run", {st_mode=S_IFDIR|0755, st_size=740, ...}) = 0
stat("/sys/fs/cgroup", {st_mode=S_IFDIR|0755, st_size=280, ...}) = 0
stat("/sys/fs/cgroup/systemd", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/fs/pstore", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/memory", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/cpu,cpuacct", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/net_cls", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/freezer", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/devices", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/blkio", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/perf_event", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/cpuset", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/fs/cgroup/hugetlb", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/kernel/config", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/", {st_mode=S_IFDIR|0555, st_size=4096, ...}) = 0
stat("/proc/sys/fs/binfmt_misc", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/dev/hugepages", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
stat("/sys/kernel/debug", {st_mode=S_IFDIR|0700, st_size=0, ...}) = 0
stat("/dev/mqueue", {st_mode=S_IFDIR|S_ISVTX|0777, st_size=40, ...}) = 0
stat("/boot", {st_mode=S_IFDIR|0555, st_size=4096, ...}) = 0
stat("/run/user/0", {st_mode=S_IFDIR|0700, st_size=40, ...}) = 0
stat("/var/lib/nfs/rpc_pipefs", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
stat("/proc/fs/nfsd", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
uname({sysname="Linux", nodename="xkey-boss01-8035-184", ...}) = 0
statfs("/", {f_type=0x58465342, f_bsize=4096, f_blocks=9293380, f_bfree=5378782, f_bavail=5378782, f_files=37191680, f_ffree=37150656, f_fsid={64768, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_RELATIME}) = 0
stat("/", {st_mode=S_IFDIR|0555, st_size=4096, ...}) = 0
statfs("/dev", {f_type=TMPFS_MAGIC, f_bsize=4096, f_blocks=494791, f_bfree=494791, f_bavail=494791, f_files=494791, f_ffree=494430, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_NOSUID}) = 0
stat("/dev", {st_mode=S_IFDIR|0755, st_size=3140, ...}) = 0
statfs("/sys/kernel/security", {f_type=SECURITYFS_MAGIC, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_NOSUID|ST_NODEV|ST_NOEXEC|ST_RELATIME}) = 0
stat("/sys/kernel/security", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
statfs("/dev/shm", {f_type=TMPFS_MAGIC, f_bsize=4096, f_blocks=497337, f_bfree=497337, f_bavail=497337, f_files=497337, f_ffree=497336, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_NOSUID|ST_NODEV}) = 0
stat("/dev/shm", {st_mode=S_IFDIR|S_ISVTX|0777, st_size=40, ...}) = 0
statfs("/run", {f_type=TMPFS_MAGIC, f_bsize=4096, f_blocks=497337, f_bfree=458142, f_bavail=458142, f_files=497337, f_ffree=496689, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_NOSUID|ST_NODEV}) = 0
stat("/run", {st_mode=S_IFDIR|0755, st_size=740, ...}) = 0
statfs("/sys/fs/cgroup", {f_type=TMPFS_MAGIC, f_bsize=4096, f_blocks=497337, f_bfree=497337, f_bavail=497337, f_files=497337, f_ffree=497324, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_RDONLY|ST_NOSUID|ST_NODEV|ST_NOEXEC}) = 0
stat("/sys/fs/cgroup", {st_mode=S_IFDIR|0755, st_size=280, ...}) = 0
statfs("/sys/fs/cgroup/systemd", {f_type=CGROUP_SUPER_MAGIC, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_NOSUID|ST_NODEV|ST_NOEXEC|ST_RELATIME}) = 0
stat("/sys/fs/cgroup/systemd", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
statfs("/sys/fs/pstore", {f_type=PSTOREFS_MAGIC, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_NOSUID|ST_NODEV|ST_NOEXEC|ST_RELATIME}) = 0
stat("/sys/fs/pstore", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
statfs("/sys/fs/cgroup/memory", {f_type=CGROUP_SUPER_MAGIC, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_NOSUID|ST_NODEV|ST_NOEXEC|ST_RELATIME}) = 0
stat("/sys/fs/cgroup/memory", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
statfs("/sys/fs/cgroup/cpu,cpuacct", {f_type=CGROUP_SUPER_MAGIC, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_NOSUID|ST_NODEV|ST_NOEXEC|ST_RELATIME}) = 0
stat("/sys/fs/cgroup/cpu,cpuacct", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
statfs("/sys/fs/cgroup/net_cls", {f_type=CGROUP_SUPER_MAGIC, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_NOSUID|ST_NODEV|ST_NOEXEC|ST_RELATIME}) = 0
stat("/sys/fs/cgroup/net_cls", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
statfs("/sys/fs/cgroup/freezer", {f_type=CGROUP_SUPER_MAGIC, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_NOSUID|ST_NODEV|ST_NOEXEC|ST_RELATIME}) = 0
stat("/sys/fs/cgroup/freezer", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
statfs("/sys/fs/cgroup/devices", {f_type=CGROUP_SUPER_MAGIC, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_NOSUID|ST_NODEV|ST_NOEXEC|ST_RELATIME}) = 0
stat("/sys/fs/cgroup/devices", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
statfs("/sys/fs/cgroup/blkio", {f_type=CGROUP_SUPER_MAGIC, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_NOSUID|ST_NODEV|ST_NOEXEC|ST_RELATIME}) = 0
stat("/sys/fs/cgroup/blkio", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
statfs("/sys/fs/cgroup/perf_event", {f_type=CGROUP_SUPER_MAGIC, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_NOSUID|ST_NODEV|ST_NOEXEC|ST_RELATIME}) = 0
stat("/sys/fs/cgroup/perf_event", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
statfs("/sys/fs/cgroup/cpuset", {f_type=CGROUP_SUPER_MAGIC, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_NOSUID|ST_NODEV|ST_NOEXEC|ST_RELATIME}) = 0
stat("/sys/fs/cgroup/cpuset", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
statfs("/sys/fs/cgroup/hugetlb", {f_type=CGROUP_SUPER_MAGIC, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_NOSUID|ST_NODEV|ST_NOEXEC|ST_RELATIME}) = 0
stat("/sys/fs/cgroup/hugetlb", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
statfs("/sys/kernel/config", {f_type=0x62656570, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_RELATIME}) = 0
stat("/sys/kernel/config", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
statfs("/dev/hugepages", {f_type=HUGETLBFS_MAGIC, f_bsize=2097152, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=2097152, f_flags=ST_VALID|ST_RELATIME}) = 0
stat("/dev/hugepages", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
statfs("/boot", {f_type=0x58465342, f_bsize=4096, f_blocks=127147, f_bfree=95769, f_bavail=95769, f_files=512000, f_ffree=511670, f_fsid={64513, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_RELATIME}) = 0
stat("/boot", {st_mode=S_IFDIR|0555, st_size=4096, ...}) = 0
statfs("/run/user/0", {f_type=TMPFS_MAGIC, f_bsize=4096, f_blocks=99468, f_bfree=99468, f_bavail=99468, f_files=497337, f_ffree=497336, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_NOSUID|ST_NODEV|ST_RELATIME}) = 0
stat("/run/user/0", {st_mode=S_IFDIR|0700, st_size=40, ...}) = 0
statfs("/proc/fs/nfsd", {f_type=0x6e667364, f_bsize=4096, f_blocks=0, f_bfree=0, f_bavail=0, f_files=0, f_ffree=0, f_fsid={0, 0}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_RELATIME}) = 0
stat("/proc/fs/nfsd", {st_mode=S_IFDIR|0755, st_size=0, ...}) = 0
fstat(1, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 7), ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7efe77096000
write(1, "\346\226\207\344\273\266\347\263\273\347\273\237                 \345\256\271"..., 70文件系统                 容量  已用  可用 已用% 挂载点
) = 70
write(1, "/dev/mapper/centos-root   36G   "..., 50/dev/mapper/centos-root   36G   15G   21G   43% /
) = 50
write(1, "devtmpfs                 1.9G   "..., 53devtmpfs                 1.9G     0  1.9G    0% /dev
) = 53
write(1, "tmpfs                    1.9G   "..., 57tmpfs                    1.9G     0  1.9G    0% /dev/shm
) = 57
write(1, "tmpfs                    1.9G  1"..., 53tmpfs                    1.9G  154M  1.8G    8% /run
) = 53
write(1, "tmpfs                    1.9G   "..., 63tmpfs                    1.9G     0  1.9G    0% /sys/fs/cgroup
) = 63
write(1, "/dev/vda1                497M  1"..., 54/dev/vda1                497M  123M  375M   25% /boot
) = 54
write(1, "tmpfs                    389M   "..., 60tmpfs                    389M     0  389M    0% /run/user/0
) = 60
close(1)                                = 0
munmap(0x7efe77096000, 4096)            = 0
close(2)                                = 0
exit_group(0)                           = ?
+++ exited with 0 +++

5、重新使用df -h命令，恢复正常。

linux
目录
  1. 1. 1、服务器使用df -h命令卡死，crtl+c没有反应，ps -ef|grep df 命令杀掉df -h进程也无效。
  2. 2. 2、重新启动会话，使用strace跟踪df -h执行状态
  3. 3. 3、启动另一个会话，重新挂在这个目录
  4. 4. 4、strace df -h 跟踪的进程内容有新的输出，完整信息输出如下：
  5. 5. 5、重新使用df -h命令，恢复正常。

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